Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9059606 | Surface motor direct-drive sucker-rod screw pump device | Jun Liu, Songbo Gou, Yongjian Tang | 2015-06-16 |
| 8702400 | Surface motor direct-drive sucker-rod screw pump device | Jun Liu, Songbo Gou, Yongjian Tang | 2014-04-22 |
| 8283879 | Braking controller of a three-phase permanent magnetic brushless DC motor for directly driving a screw pump | Jun Liu, Yongjian Tang | 2012-10-09 |